Hi
As we know, in deep sub-micron design, we usually model the slew ( transition time) between the trip points 30% to 70%. It is said that it will lost some accuracy when using the trip points fro 10% to 90%. Could you tell the cause why using the trip points from 30% to 70% ? Is there any document or material talking about this topic ?
Thanks very much!
Yeah. we usually use 30-70 as the trip measure points to characterize the slew number in timing library. But I do not know why select such pair of points to model the transtion time.
Thanks!